[ https://issues.apache.org/jira/browse/SPARK-5766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-5766. ------------------------------ Resolution: Not A Problem Or to some degree this is already done via netlib > Slow RowMatrix multiplication > ----------------------------- > > Key: SPARK-5766 > URL: https://issues.apache.org/jira/browse/SPARK-5766 > Project: Spark > Issue Type: Improvement > Components: MLlib > Reporter: Amaru Cuba Gyllensten > Priority: Minor > Labels: matrix > > Looking at the source code for RowMatrix multiplication by a local matrix, it > seems like it is going through all columnvectors of the matrix, doing > pairwise dot product on each column. > It seems like this could be sped up by using gemm, performing full > matrix-matrix multiplication on the local data, (or gemv, for vector-matrix > multiplication), as is done in BlockMatrix or Matrix. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org